Author: John Merlino
Date: 17:14:28 04/14/03
Go up one level in this thread
On April 14, 2003 at 15:15:48, Ulf Flörsheimer wrote: >In a game between Shredder 7.04 and Chess Tiger 15 (ChessBase, style normal), 25 >minutes per game, no pondering, P4-2400, both 96 MB-Hashtables Chess Tiger made >a big tactical mistake: > >[Event "Wettkampf P4-2400, Blitz:25'"] >[Site "?"] >[Date "2003.04.14"] >[Round "12"] >[White "Chess Tiger 15.0"] >[Black "Shredder 7.04"] >[Result "0-1"] >[ECO "A80"] >[PlyCount "52"] > >1. d4 f5 2. Nc3 d5 3. Bg5 Nf6 4. e3 e6 5. Nf3 Be7 6. Bd3 c5 7. dxc5 O-O 8. a3 >Ne4 9. Bxe4 fxe4 10. Bxe7 Qxe7 11. Nd4 Nc6 12. Nb3 Qg5 13. O-O Ne5 14. Qe2 Nf3+ >15. Kh1 Rf6 16. gxf3 exf3 17. Rg1 Qh5 18. Rg5 Qxg5 19. Qf1 Qh5 20. Nd2 Rh6 21. >Qg1 Rg6 22. Qf1 e5 23. Nxd5 Rg2 24. Nxf3 Bh3 25. Qd1 Rxf2 26. e4 Rf8 0-1 > >Have a look on Tigers move 14. Qe2?? (eval.: -0.12 at depth 13, expecting Bd7): >Tiger has absolutely no idea of the further Nf3+!! which ends the game. > >It takes Tiger more than 3 minutes to evaluate Qe2 with -0.62 (at depth 15), >expecting Nf3+, where -0.62 is still a very optimistic. And it takes nearly 7 >minutes to find a slightly better move (Nb5, -0,44). > >I think this position could be helpful for further improvements of your >impressive strong engine. > >Greetings >Ulf As suggested by Uri, here are some test positions: 1) Avoid 14.Qe2 [D]r1b2rk1/pp4pp/4p3/2Ppn1q1/4p3/PNN1P3/1PP2PPP/R2Q1RK1 w - - 0 14 Chessmaster 9000 (on a P3-733) gives up on Qe2 in less than a second, and eventually settles on 14.Ne2: Time Depth Score Positions Moves 0:00 1/3 0.28 2205 14.Nd4 Bd7 15.Qd2 Rac8 0:00 1/3 0.32 3574 14.Nb5 Bd7 15.Nd6 0:00 1/4 0.05 4908 14.Nb5 Nf3+ 15.Kh1 Nh4 16.g3 0:00 1/4 0.22 6196 14.Nd4 Nf3+ 15.Kh1 Nh4 16.g3 Ng6 0:00 1/4 0.25 6931 14.Qe2 Bd7 15.Nd4 Rac8 0:00 1/5 0.19 15189 14.Qe2 Bd7 15.Nd4 Rac8 16.b4 0:00 1/5 0.21 21869 14.Nd4 Bd7 15.b4 Rae8 16.Qd2 0:00 1/6 0.25 46489 14.Nd4 Bd7 15.Qe2 Rae8 16.b4 Qh4 0:01 1/7 0.11 120168 14.Nd4 Bd7 15.Qe2 Rac8 16.Nb3 b6 17.cxb6 axb6 0:03 1/7 0.17 289979 14.Ne2 Bd7 15.Nf4 Nf3+ 16.Kh1 Ne5 17.Na5 b6 18.c6 0:06 1/8 0.13 552333 14.Ne2 Bd7 15.Nf4 Nf3+ 16.Kh1 Ne5 17.Nd4 Rae8 18.Qd2 0:19 1/9 0.18 1740953 14.Ne2 Bd7 15.Nf4 Rac8 16.Qe2 Nf3+ 17.Kh1 Ne5 18.Nd4 Qf6 0:43 1/10 0.17 4057961 14.Ne2 Bd7 15.Nf4 Rac8 16.Nd4 Nf3+ 17.Nxf3 exf3 18.Qxf3 Rxc5 19.Qd1 Rc4 20.Qe2 Rfc8 2) Best Move 14...Nf3+ [D]r1b2rk1/pp4pp/4p3/2Ppn1q1/4p3/PNN1P3/1PP1QPPP/R4RK1 b - - 0 14 CM9000 chooses this move in 40 seconds: Time Depth Score Positions Moves 0:00 1/3 0.21 1244 14...Bd7 15.Nd4 Rac8 0:00 1/4 0.16 5006 14...Bd7 15.Nd4 Rac8 16.b4 0:00 1/5 0.23 17250 14...Bd7 15.Nd4 Nf3+ 16.Kh1 Nxd4 17.exd4 Qf6 18.Rad1 0:00 1/6 0.14 74612 14...Bd7 15.Rad1 Rac8 16.a4 Qf6 17.a5 0:03 1/7 0.01 275512 14...Bd7 15.Nd4 Rac8 16.b4 b6 17.Qa6 bxc5 18.Nxe6 Nf3+ 19.Kh1 0:06 1/8 0.03 507382 14...Bd7 15.Nd4 Rac8 16.b4 b6 17.Nb3 Nf3+ 18.Kh1 Ne5 0:33 1/9 -0.01 2887143 14...Bd7 15.a4 Be8 16.Rfc1 Bh5 17.Qb5 Nf3+ 18.Kh1 Qh4 19.gxf3 Bxf3+ 20.Kg1 Qg5+ 21.Kf1 Qg2+ 22.Ke1 Qxh2 0:40 1/9 -1.23 3552720 14...Nf3+ 15.Kh1 Rf6 16.Nd4 Qh5 17.h3 e5 18.Nf5 Bxf5 19.Nxd5 Re6 0:56 1/10 -1.48 5108875 14...Nf3+ 15.Kh1 Rf6 16.Nd4 Qh5 17.h3 e5 18.Nf5 Bxf5 19.Nxd5 Rh6 20.Qc4 Kh8 1:24 2/11 -2.17 7949584 14...Nf3+ 15.Kh1 Rf6 16.Nd4 Qh5 17.h3 e5 18.Nxe4 dxe4 19.Qc4+ Qf7 20.Qxf7+ Rxf7 21.Ne2 Ng5 22.Kg1 Rd7 3) Best Move 15...Rf6 [D]r1b2rk1/pp4pp/4p3/2Pp2q1/4p3/PNN1Pn2/1PP1QPPP/R4R1K b - - 0 15 CM9000 chooses this move in 5 seconds, but needs 10 seconds to give it a winning score: Time Depth Score Positions Moves 0:00 1/3 0.38 1805 15...Ne5 16.Nb5 Bd7 17.Nd6 0:00 1/4 0.34 5195 15...Ne5 16.Nb5 Qf6 17.Nd6 0:00 1/4 0.31 12734 15...Bd7 16.c6 Nh4 17.g3 0:00 1/5 1.31 21135 15...Bd7 16.c6 Bxc6 17.gxf3 exf3 0:00 1/5 0.46 25391 15...Ne5 16.Nb5 Bd7 17.Nd6 Rab8 18.Rad1 0:00 1/5 0.35 29588 15...Nh4 16.Rg1 Qf6 17.Nd4 Qxf2 18.Raf1 0:00 1/6 0.48 52001 15...Nh4 16.Rg1 Qf6 17.Nd4 Bd7 18.Qg4 Nf5 19.Nxf5 exf5 0:01 1/6 0.16 92413 15...Bd7 16.Nd4 Ne5 17.Kg1 Rac8 18.b4 0:02 1/7 0.31 193324 15...Bd7 16.Nd4 Nh4 17.f4 exf3ep 18.Nxf3 Nxf3 19.Rxf3 Rac8 0:05 1/7 0.18 467714 15...Rf6 16.Nd4 Qh5 17.h3 Bd7 18.Rfd1 Rc8 19.Nxf3 exf3 0:10 1/8 -1.23 952773 15...Rf6 16.Nd4 Qh5 17.h3 e5 18.Nf5 Bxf5 19.Nxd5 Re6 0:20 1/9 -1.63 1817902 15...Rf6 16.Nd4 Qh5 17.h3 e5 18.Nf5 Bxf5 19.Nxd5 Re6 20.Rfd1 Bxh3 0:42 1/10 -2.17 3902747 15...Rf6 16.Nd4 Qh5 17.h3 e5 18.Nxe4 dxe4 19.Qc4+ Qf7 20.Qxf7+ Rxf7 21.Ne2 Ng5 22.Kg1 Rd7 jm
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